R help - Dec 2006 - cloud() question

Hello,
 
I am trying to plot lines in 3 dimensions from a multiple linear model
to illustrate the interaction of two of the explanatory variables. I'm
trying to use the cloud function (though I'm open to a different
function if an easier one exists). I keep getting the error message:
 
Error in cloud(lmPeHa061201, data = PeHa061201, cex = 0.8, main "Table 99:
PeHa",  :
        no applicable method for "cloud"

I have tried to make my command look just like the examples but am at a
loss as to why I don't have an "applicable method". I enter: 
 
lmPeHa061201=lm(sqrtplants~sqrtPlantsPrev+Site+NumFruitedPrev+HerbPrevious+RainfallJulyJuneprev+RainfallJulyJune+
(Site*HerbPrevious)+(HerbPrevious*NumFruitedPrev)+(RainfallJulyJune*RainfallJulyJuneprev),
data=PeHa061201)

par.set <-
    list(axis.line = list(col = "transparent"), clip = list(panel
FALSE))
 
print(cloud(lmPeHa061201, data=PeHa061201, cex = .8, 
 screen = list(z=20, x=-70, y=0),
 par.settings = par.set,
 distance = .4, zoom = .6))
 
If I could get past this error, I'd like to add a line (with abline()
??) to show just one (and then potentially others on the same plot) of
the interaction factors but I'm not sure if this will work either. 
 
Any thoughts?
 
Thanks,
 
Michelle

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On 12/1/06, Michelle DePrenger-Levin <DePrengM at botanicgardens.org>
wrote:
> Hello,
>
> I am trying to plot lines in 3 dimensions from a multiple linear model
> to illustrate the interaction of two of the explanatory variables. I'm
> trying to use the cloud function (though I'm open to a different
> function if an easier one exists). I keep getting the error message:
>
> Error in cloud(lmPeHa061201, data = PeHa061201, cex = 0.8, main >
"Table 99: PeHa",  :
>         no applicable method for "cloud"
>
> I have tried to make my command look just like the examples but am at a
> loss as to why I don't have an "applicable method". I enter:
>
>
lmPeHa061201=lm(sqrtplants~sqrtPlantsPrev+Site+NumFruitedPrev+HerbPrevious+RainfallJulyJuneprev+RainfallJulyJune+
>
(Site*HerbPrevious)+(HerbPrevious*NumFruitedPrev)+(RainfallJulyJune*RainfallJulyJuneprev),
> data=PeHa061201)
>
> par.set <-
>     list(axis.line = list(col = "transparent"), clip = list(panel
> FALSE))
>
> print(cloud(lmPeHa061201, data=PeHa061201, cex = .8,
>  screen = list(z=20, x=-70, y=0),
>  par.settings = par.set,
>  distance = .4, zoom = .6))
What example does this look like exactly? Normally, the first argument
of cloud has to be a formula that looks like 'z ~ x * y'. In your
call, it is the result of a call to lm, which among other things, is
not a formula.

It's difficult to suggest alternatives without a reproducible example.
> If I could get past this error, I'd like to add a line (with abline()
> ??) to show just one (and then potentially others on the same plot) of
> the interaction factors but I'm not sure if this will work either.
Probably not. Adding stuff to 3-d plots are harder than for 2-d plots.

-Deepayan